3.1. Comparison of pretreatments
Table 4 shows the obtained results (average of three replica-tions) after the pretreatments proposed in Fig. 1.
An analysis of variance (ANOVA) were carried out with these
results and p-values presented in Table 5 shows that chitosan treat-ment is significant for all the evaluated responses, centrifugation is
significant for turbidity and color reductions, while the enzymatic
treatment is significant only for viscosity, at p < 0.05.
The results presented in Table 4 are analyzed in Figs. 2–5 in
terms of percentage of reduction for turbidity, color, TSS, and vis-cosity, respectively, of the passion fruit juice after the proposed
treatments in relation to the raw juice and to the juice centrifuged
at 4000 rpm.
Fig. 2 shows that the treatments employing chitosan (T5–T8)
ensures a turbidity reduction of almost 100% regarding to the raw